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Hi. My name is***** Thank you for your question. How long has Sweetie not been eating? How long ago did these kittens get brought into the house? Is she having any vomiting?
Could she have eaten some of the kitten's food right away and got an upset stomach? When did she vomit?
Ok. Some cats can definitely get stressed when new additions to the house are made. So for her to go off food with their arrival isn't surprising. For her to start vomiting though, that is a little more eye catching. Some can make themselves really sick by not eating for 3-5 days and they start to get a situation called fatty liver. This can happen in any cat that isn't eating. They start to break down body fat for energy and it overwhelms the liver and causes lipid deposits there. They start to get jaundice to the white of the eye, the lips and the inner ears (these are typically the easiest places to see it). Could she have eaten something that has upset her that isn't realized? Could she be sick for some other reason? Honestly, if she's not eating by tomorrow or the vomtiing continues, she should be seen by your vet to check her over. They can at the least get something sent home to hopefully settle her stomach and to help her through this transition.
Give her some time to rest here tonight and then start to have the food and water available again. I would give her plenty of separation from the kittens and try to reduce all stress that they may be producing. Hopefully things will turn the corner here and everything will start to get better!